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Property, Plant and Equipment (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Property, Plant and Equipment  
Capital expenditures for American Centrifuge Project$ 1,252,500,000$ 1,143,800,000
Capitalized asset retirement obligations19,300,000 
Expensed centrifuge machines9,600,000 
ACP spending reduction in October 201130.00% 
Upper range of anticipated RD&D program funding300,000,000 
Upper range of potential future expense for centrifuge machine disposal100,000,000 
Upper range of potential ACP asset impairment expense$ 1,300,000,000